deprecation: deprecate the use of remove_route

sanic/app.py

@@ -555,12 +555,20 @@ class Sanic:
         This method provides the app user a mechanism by which an already
         existing route can be removed from the :class:`Sanic` object
 
+        .. warning::
+            remove_route is deprecated in v19.06 and will be removed from future versions.
+
         :param uri: URL Path to be removed from the app
         :param clean_cache: Instruct sanic if it needs to clean up the LRU
             route cache
         :param host: IP address or FQDN specific to the host
         :return: None
         """
+        warnings.warn(
+            "remove_route is deprecated and will be removed from future versions.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
         self.router.remove(uri, clean_cache, host)
 
     # Decorator